Consider a Cell That Is Provided Aspartate in Which All $\beta$

Multiple Choice

Consider a cell that is provided aspartate in which all carbons are radioactively labeled. Compounds in the cell are analyzed after the biosynthesis and subsequent breakdown of pyrimidines. Which of the following compounds would display no radioactivity signal during the analysis?

A) " $\beta$ -alanine"
B) "glutamine"
C) " $\beta$ -aminoisobutyrate"
D) "dihydrouracil"